One of the world's richest men has bucked the Facebook share sell-off trend by investing $10.1 million in the plummeting stock, which has shed almost 50 percent of its value since its public offering in May.

Legendary investor George Soros clearly 'likes' the tanking stock after investment filings revealed he bought 341,000 shares in the social network site in the second quarter, the UK's Telegraph reports.

But the move has not yet paid off for the hugely successful hedge fund investor.

Facebook's share value has plunged a further 34 percent since Soros bought the stock amid doubts over the value of the company.

It is estimated Soros has lost $3 million on the stock in that time, with Facebook shares now priced at just over $20 after their IPO at $38.